Slide-valv?



May 13, 1930.

Fig.4. K

C. H. l

SLIDE Fil 2 Sheets-Sheet 2 40 so 120 150 200D Crwzkshq/t Degrees INVENTOR.

ATTOQQNEX Patented May 13, 1930 UNITED STATES I CONRAD H. MATTHIESSE' SLIDE-VALV Application filed February My invention relates to a slide valve mech anism for internal combustion engines of th four cycle type.

One of the objects of my invention is t provide a plug and sleeve valve mechanism i1 which the sleeve will admit the gaseous mix ture freely into the combustion chamber dur ing the suction stroke of the main piston and for a part of its return stroke, and in whicl the plug will quickly cut off the inlet at a pre determined point during the beginning 0: said return stroke.

In my prior Patent No. 1,492,573, of May 6 1924, the ported sleeve valve of itself opened kept open and closed the inlet port. I havl ascertained that with such a construction th closing of the inlet by the sleeve began tor soon and that a long time was occupied in th closing action. The amount of gaseous mix ture fed in was thereby reduced.

In accordance with my invention, I lltlllZt the ported sleeve valve to open and keep ope: the inlet and cause the plug in the admissioi period of the gaseous mixture to quickly 0108 the inlet and stop the admission. The 21111011111 of the gaseous mixture fed into the combus tion chamber is thereby increased. The plug after the admission is stopped, is caused tg block the inlet during the compression anc firing cycles, thus preventing the gaseous mixture from being forced back through the port in the sleeve.

.Vith the above and other objects in viev my invention consists in the parts, improvements and combinations more fully pointe out hereinafter.

Turning now to the drawings:

Figure 1, is a sectional detail of the plug and sleeve valve mechanism, in which thq sleeve is about to open the inlet passage ii the valve head.

Figure 2, is a sectional detail, showing tl'li sleeve keeping the inlet passage open.

Figure 3, is a sectional detail showing the plug closing the inlet.

vr OFFICE he area of inlet opening and the rees that the main crank shaft .he degrees being indicated as the units of valve opening be as ordinates. idicates the upper bevel gears e overhead valve shaft, and ndicates the lower bevel gears which the main crank shaft rmediary shaft, which, in turn, rhead valve shaft. working piston 1, drives the .iaft 2, through connecting rod 4. This piston reciprocates in ving a jacket 6. The valve head axial extension of the cylinder, ith inlet passages 8 and ex- 9. The main crank shaft 2, by s 10, 11, intermediary shaft 12 (1 gears 13, 14, drives the oven" afp 15, at half the speed of the Lil t. e mechanism is arranged in the he cylinder. This "consists of a 3 and a plug valve 17, the sleeve :ated by connecting rod 18, and verhead valve shaft 15, and the :iprocated within the sleeve by d 20 and crank 21, connected LCl valve shaft 15 and separated from crank 19. The sleeve is i a prolonged port 22, and the e sleeve port to the inlet pash that the sleeve port, itself, .et passage 8, by its movement passage. At this time the crank, esth'e sleeve is at the inlet posishown as approximately sixty ts top dead center. At this time 3 arranged as not to block the operating crank being at about lt'er when the crank of the main 0 five degrees past its top dead :ommencement of the opening of hown in Figure 1'. The sleeve e intake fully open. The intake lly open in Figure 2. During rations the port 22 in the sleeve the inlet passage 8, and the feet in determining the admission-in either of these operations. Between the positions of the parts shown in Figure 2, and in Figure 3, the plug begins to close the inlet. The port 22 in the sleeve continues to register with the inlet passage 8.

When the valve parts are moving from the position shown in Figure 1, toward the position shown in Figure 2, the main piston 1 has accomplished its suction stroke, and has begun its return. During the beginning of this return the main piston arrives at the position shown in Figure 4:. The plug valve, which as shown in Figures 2 and 3, by reason of the position of its operating crank 21, is moving rapidly downward and when crank at, of the main piston has made about a quarter turn past bottom dead center, as shown in Figure 4, the plug closes the port in the sleeve, cutting off the admission. The

plug, after the admission is stopped, blocks the inlet during the compression and firing cycles and thus prevents the gaseous mixture from being forced back through the port in the sleeve.

In the best embodiment of the invention,

the port in the sleeve by reason of its wide,

horizontal cross-sectional area with relation to the combustion chamber, is controlled by the plug. This isshown in Figure 5, in which the admission begins at point A (the i parts being then in the position shown in Figure 1), the sleeve continues to open the admission until the point B is reached. The sleeve port now keeps the inlet full open from the point B to the point C (the parts at a point along the line BG have assumed the position shown in Figure 2). From the position C to the position D, the plug is throttling and closing the inlet, D indicating the closure (with the parts in the position shown in Figures 8 and 4.

Having thus described the construction and operation of the invention, it will be understood that changes may be made in carrying the invention into effect without departing from the principle thereof.

What I claim is:

1. In an internal combustion engine of the four cycle type comprising a working cylinder, a valve head, forming an axial extension of the cylinder, provided with an inlet passage and an exhaust passage, and having a working piston within said cylinder, a sleeve slide valve reciprocating within said valve head, a plug within said slide valve,

said sleeve valve provided with a port and with a skirt portion for controlling the exhaust passage, and means whereby a pair of separated cranks reciprocate said sleeve and plug, so that the port in the sleeve, by its movement with relation to the inlet passage in the cylinder, in itself, opens and keeps open the inlet for the admission of gas during the inlet cycle and the plug will cut off the admission of gas, at the beginning of the return stroke of the working piston, said plug with the inlet cut oif blocking the inlet port during the compression and firing cycles.

2. In an internal combustion engine of the four cycle type comprising a cylinder, a working piston reciprocating in said cylinder, and a valve head forming an axial extension of said cylinder, the valve head being provided with an outer inlet passage and an inner exhaust passage, a sleeve slide valve reciprocating within said head, a plug within said slide valve, said sleeve valve provided with an inlet port and with a skirt'portion controlling the exhaust passage, an overhead half-speed valve shaft, means whereby a pair of cranks and connecting rod connections between said valve shaft and said sleeve and plug valves respectively, reciprocate said valves, whereby said inlet passage is opened and kept open by the inlet port in the sleeve and the plug is actuated to cut off the admission at about one quarter of the return stroke of the working piston and to block the inlet port during the compression and firing cycles.

3. In an internal combustion engine of the four cycle type comprising a working cylinder, a working piston reciprocating within said cylinder, and a valve head forming an,

axial extension of said cylinder, provided with an inlet passage and an exhaust passage, a sleeve slide valve reciprocating within said valve head, a plug within said slide valve, said sleeve valve provided with a skirt portion controlling the exhaust passage and with a nonthrottling inlet port, the cross-sectional area of the inlet port being greater than the cross sectional area of the inlet passage, and means whereby a pair of cranks reciprocate said sleeve and-plug, so that the inlet port in the sleeve in itself, opens and keeps open the inlet for the admission of gas during the inlet cycle, and the plug will cut off the admission of gas at the beginning of the return stroke of the working piston, said plug with the inlet cut off blocking the inlet port during the compression and firing cycles.

l. In an internal combustion engine of the four cycle type comprising a working cylinder, a valve head provided with an exhaust and an inlet passage, a ported sleeve valve and a plug valve within said valve head, the combination of means for reciprocating said sleeve valve to open and keep open the inlet and means for reciprocating the plug valve to cut oil the inlet.

In testimony whereof, I have signed my name to this specification.

CONRAD H. MATTHIESSEN, JR. 

